<html>
<head>
<base href="https://llvm.org/bugs/" />
</head>
<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW " title="NEW --- - clang c11 atomics are non-conforming" href="https://urldefense.proofpoint.com/v2/url?u=https-3A__llvm.org_bugs_show-5Fbug.cgi-3Fid-3D24108&d=AwMBaQ&c=8hUWFZcy2Z-Za5rBPlktOQ&r=pF93YEPyB-J_PERP4DUZOJDzFVX5ZQ57vQk33wu0vio&m=d8DEj-fjuyOshb2zw5WtKEfrGX6_-wgLLJS_yy1ZcCw&s=jb2VwFeJf5kUMFSTjl1MN7pZZPGf0oJg09FbGOhFtGY&e=">24108</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>clang c11 atomics are non-conforming
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>3.6
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>Frontend
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>stefan.teleman@oracle.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=14584" name="attach_14584" title="c11 atomics test program">attachment 14584</a> <a href="attachment.cgi?id=14584&action=edit" title="c11 atomics test program">[details]</a></span>
c11 atomics test program
The following test program:
/* at.c */
#include <stdio.h>
#include <stdlib.h>
#include <stdatomic.h>
struct Test {
int i;
_Atomic int ai;
double d;
_Atomic double ad;
};
int main()
{
struct Test T;
_Atomic struct Test AT;
_Atomic struct Test *TP = ATOMIC_VAR_INIT(NULL);
T.i = 1;
AT.i = 0;
T.ai = ATOMIC_VAR_INIT(1);
AT.ai = ATOMIC_VAR_INIT(0);
T.d = 2.5;
AT.d = 1.5;
T.ad = ATOMIC_VAR_INIT(2.5);
AT.ad = ATOMIC_VAR_INIT(1.5);
(void) fprintf(stdout, "T.i=%i, T.ai=%i, T.d=%lf, T.ad=%lf\n",
T.i, T.ai, T.d, T.ad);
(void) fprintf(stdout, "AT.i=%i, AT.ai=%i, AT.d=%lf, AT.ad=%lf\n",
AT.i, AT.ai, AT.d, AT.ad);
atomic_store(&AT, T);
(void) fprintf(stdout, "T.i=%i, T.ai=%i, T.d=%lf, T.ad=%lf\n",
T.i, T.ai, T.d, T.ad);
(void) fprintf(stdout, "AT.i=%i, AT.ai=%i, AT.d=%lf, AT.ad=%lf\n",
AT.i, AT.ai, AT.d, AT.ad);
return 0;
}
----------------------------------------------------------------------------
When compiled on Fedora 21 x86_64 with clang 3.6.1, using the official
Fedora binaries from llvm.org:
/usr/local/clang-361/bin/clang --version
clang version 3.6.1 (tags/RELEASE_361/final)
Target: x86_64-unknown-linux-gnu
Thread model: posix
--------------------------------------------------------------------------
/usr/local/clang-361/bin/clang -m64 -O0 -std=c11 -Wall -emit-llvm -S at.c -o
at.ll
--------------------------------------------------------------------------
at.c:19:5: error: member reference base type '_Atomic(struct Test)' is not a
structure or union
AT.i = 0;
~~^~
at.c:21:5: error: member reference base type '_Atomic(struct Test)' is not a
structure or union
AT.ai = ATOMIC_VAR_INIT(0);
~~^~~
at.c:23:5: error: member reference base type '_Atomic(struct Test)' is not a
structure or union
AT.d = 1.5;
~~^~
at.c:25:5: error: member reference base type '_Atomic(struct Test)' is not a
structure or union
AT.ad = ATOMIC_VAR_INIT(1.5);
~~^~~
at.c:30:20: error: member reference base type '_Atomic(struct Test)' is not a
structure or union
AT.i, AT.ai, AT.d, AT.ad);
~~^~
at.c:30:26: error: member reference base type '_Atomic(struct Test)' is not a
structure or union
AT.i, AT.ai, AT.d, AT.ad);
~~^~~
at.c:30:33: error: member reference base type '_Atomic(struct Test)' is not a
structure or union
AT.i, AT.ai, AT.d, AT.ad);
~~^~
at.c:30:39: error: member reference base type '_Atomic(struct Test)' is not a
structure or union
AT.i, AT.ai, AT.d, AT.ad);
~~^~~
at.c:37:20: error: member reference base type '_Atomic(struct Test)' is not a
structure or union
AT.i, AT.ai, AT.d, AT.ad);
~~^~
at.c:37:26: error: member reference base type '_Atomic(struct Test)' is not a
structure or union
AT.i, AT.ai, AT.d, AT.ad);
~~^~~
at.c:37:33: error: member reference base type '_Atomic(struct Test)' is not a
structure or union
AT.i, AT.ai, AT.d, AT.ad);
~~^~
at.c:37:39: error: member reference base type '_Atomic(struct Test)' is not a
structure or union
AT.i, AT.ai, AT.d, AT.ad);
~~^~~
12 errors generated.
--------------------------------------------------------------------------
When compiled with GCC 4.9.2 in Fedora 21:
/usr/bin/gcc --version
gcc (GCC) 4.9.2 20150212 (Red Hat 4.9.2-6)
Copyright (C) 2014 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
---------------------------------------------------------------------------
/usr/bin/gcc -m64 -O0 -std=c11 -Wall -c at.c -o at.o
---------------------------------------------------------------------------
at.c: In function 'main':
at.c:16:24: warning: unused variable 'TP' [-Wunused-variable]
_Atomic struct Test *TP = ATOMIC_VAR_INIT(NULL);
---------------------------------------------------------------------------</pre>
</div>
</p>
<hr>
<span>You are receiving this mail because:</span>
<ul>
<li>You are on the CC list for the bug.</li>
</ul>
</body>
</html>